Cartrack doing nothing re.my complaint.

I wrote a complaint on Hellopeter regarding the transfer of ownership in my name for a car I bought second hand. Cartrack responded they "will look into the matter" Yet, the previous owner is still receiving thteatening emails re. A " transfer of ownership" fee she has to pay. I HAVE ALLREADY PAID THIS R350 at mmone.masius 's office on 5 Dec 2022 and was provided with a tracking device certificate -HerbstHERB00270G1C. What more can I do?